Which environment would be most likely to produce trees without annual rings?
a. tropical rain forest
b. northern evergreen forest
c. areas with alternating wet and dry seasons
d. temperate-deciduous forests
e. annual rings are characteristic of all trees
a
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Which of the following environmental factors generally do(es) not have an impact on the efficiency of an antimicrobial agent?
A. presence or absence of a biofilm B. concentration of organic matter C. refractive index D. pH
Many patients who have a certain blood clotting disorder in which the blood clots too readily have a mutation in the promoter of a gene. This mutation most likely
A) deletes a gene for a clotting factor. B) blocks transcription of a clotting factor. C) increases susceptibility to a specific viral infection. D) increases the transcription rate of a particular clotting factor gene.
Acacia trees provide food and shelter for ants. In turn ants protect the Acacia trees from herbivorous insects. This relationship exemplifies
A. mutualism. B. parasitism. C. commensalism. D. amensalism.
Prokaryotic operons typically include a(n) ________ and a(n) ________ with multiple genes
A) operator; terminator B) operator; promoter C) promoter; repressor D) inducer; repressor E) CAP-binding site; inducer